Games like Columbine
Games like Columbine include Hotline Miami, Mina the Hollower, Hotline Miami 2: Wrong Number, SANABI, and Door Kickers: Action Squad. We matched them by the tags players give Columbine on Steam (Top-Down Shooter, Action, 2D Platformer, Shooter, and 2D): closest matches first, and among equally close ones the better-known games.

Hotline Miami
Shared: Action · Top-Down · Pixel Graphics

Mina the Hollower
Shared: 2D Platformer · Top-Down · Pixel Graphics

Hotline Miami 2: Wrong Number
Shared: Action · Pixel Graphics · Top-Down

SANABI
Shared: Action · 2D Platformer · Pixel Graphics

Door Kickers: Action Squad
Shared: 2D Platformer · Action · Shooter

Broforce
Shared: Action · 2D · Pixel Graphics

Katana ZERO
Shared: Action · 2D Platformer · Pixel Graphics

12 is Better Than 6
Shared: Action · Top-Down Shooter · Shooter

Escape From Duckov
Shared: Action · Top-Down Shooter · Shooter

BALL x PIT
Shared: Action · Top-Down Shooter · Top-Down

Super Meat Boy
Shared: 2D Platformer · 2D · Pixel Graphics

Gravity Circuit
Shared: Action · 2D · 2D Platformer

Nuclear Throne
Shared: Action · Top-Down Shooter · Pixel Graphics

Police Stories
Shared: Action · Top-Down Shooter · Shooter

Pizza Tower
Shared: 2D Platformer · Action · Pixel Graphics

Skul: The Hero Slayer
Shared: Action · 2D · Pixel Graphics

Titan Souls
Shared: Action · Pixel Graphics · 2D

Intravenous
Shared: Top-Down Shooter · Action · Top-Down

Angel at Dusk
Shared: Action · Shooter · 2D

Vampire Survivors
Shared: 2D · Pixel Graphics · Action

Ambidextro
Shared: Action · 2D Platformer · Pixel Graphics

Terminator 2D: NO FATE
Shared: 2D Platformer · Action · Shooter

D'LIRIUM
Shared: Top-Down Shooter · 2D · Action

Alex Jones: NWO Wars
Shared: Action · 2D Platformer · Shooter